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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e69e072a6829383e86e183665e7639989d36be87ea25f8a051b67558b65df12e' 
  AND token = 'u2kVdkYjty6o12S4EjEgNUbQ3MC4aBV9ZfxavpQTxCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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