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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2dda288e7a08ec92abe2f39fde8149241e4db6d25926409283394a7c84dbcef9' 
  AND token = 'Hj+cuv5ea1jhQ8J7f42XTSaekPZ4FgBYJj8cEiC9wg8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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