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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba2b986bb2af723338c3cd97a8c5a6b443a560b8b3d57f19ce1b17bcff046313' 
  AND token = 'Pzi0ySesrmpUDbCr1Ywd0hOCjGLJn8JwI5i9uSbacjo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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