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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'effd8d66da0f7a9c2ceacc408b24937e38b4554add2cafa974d7220834f10f81' 
  AND token = 'PLNBwNuERaiN9/YEOiMSNd5L71B8Oojz4pWfp9xw0HI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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