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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fce67348cc226844e9562607fff7db1a01a8bc343d588ea78d0028c364b3718a' 
  AND token = 'wC0j9o/pKiFnSiMy9klhvZK9qMtYaTAbwUT55Jyb2AE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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