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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03b0c596a963ccc6fee6c42f5a4f73d73a0104a15460bb95dbe3beeb4cb1bf05' 
  AND token = 'jzkkjYVuYwO5dC00Is6QZ1mRLnizX3dFgIwqIz3WIh0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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