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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcdb29e9a91b1656db4051a7e07b5c4c4c7ab64ea2fd73d76807aed477931755' 
  AND token = 'kP6LE21R4JDG2smFxr8gRH2Ngs6o/7uBU26W3cc9bjw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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