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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68fbbfde7bca42554b045862b90ac2ac67f258143a5ae878fa06444bd59ae680' 
  AND token = 'XRc4Ih2nYw1Ic8w25GTUdN7G3IlSqYvQ4bFPp4hi+sc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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