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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfd5a126c3bc9bfb807ac16def14af60cb843f1a2a0309911721a81062c688fe' 
  AND token = 'pnE2eovbOnxoB838+KpA8e+bURD+/YjfD4weffORZNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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