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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34ed838d317fd1693a57e2b0753d3df3bcebc4a0641fe66fd3266adf8d9be8ee' 
  AND token = '+skrGz1669FZY03wKHTshE9gFMUM6p16dGP+UNdUomo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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