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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd9c4d0d96cc09daf68193a9e1998d84bde66b170a031ceded25564866d740b5' 
  AND token = 'w62UpUbDFQ4bbM70bzY9CDxGOeedz6kOVms9P7QCKnI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}