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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c884b5b2a57a686fe217ab6b0f26f44fcef5baa6868616bf13bd262b58526b9c' 
  AND token = '/jzTjpibQUe985c1i83aVDflcz47+/gZ3nqDW7wuTgY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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