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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08b2581324936e3fa5bb8a4fa6660583fb7c265d029ad33c6d6a637e14b11e6b' 
  AND token = 't6Z/kddMEHdt8hkZGJ8nIAyCFhVRnCiY6lsXjd1nq8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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