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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40525815d4d325fe4dde821b16526d15512fd55ca997652f5ac76cc2bae83e0e' 
  AND token = 'm0iWgKYnkAadgGRQ0eq8lgxO8+cjrD4Qdh9ovI5N7wg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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