SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a22c6ab5e6f1549499728fac104159ae7ddb58d92679eeb63a6b5ebdcc955324' 
  AND token = 'aBbFeIKhSGtclhOJ781KmESBrvvH/xmfIIoVQzP/w44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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