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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '556cac6d224d9194cf73661d230b5934f38d0ecb29f76d014c2fb179479dcd03' 
  AND token = 'y9spHwPPR+SpNfB1T0P0dQksq8jNavceSGPgclaFYjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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