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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8786da6e89db38df91d565791c1a4a4c5df8b1b073637072360a365ee7b7734' 
  AND token = 'dBajTfRxc28HKusBXXRMWAI+frzMhR0EDBEJNINDCuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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