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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e611a8e7a9831ebfa4d81152a5cb7c4f59dd855808dc30b08b9c0abfda411814' 
  AND token = 'yhsccIkxqkDfPn9UHUeirvebhNBqVlqE6BvZMy4I1/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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