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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73a568260125139670a924233a5c1a34d87872cd0b17d29240d952cd863bdba9' 
  AND token = 'iBK9yBsj14rCCnXh3XZ/SykcA7Ybs3kI6Ek1tYt2zaQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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