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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ee68d15fc9245bee820b3dbb03928d717678435c0b00bf1bce8979d34688a75' 
  AND token = '+kM5oNfp/B4Jy+Zrc8z5RqUcZ1TC1zSQQcCLu6H1zAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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