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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ddc9767bd5d050260e1d22c7de3eeb8f1d8f51b20808ec42553e29d5f4edea7' 
  AND token = 'Xfhgxubp3NaY1XnWm4zAtxQkk/kUySErwdIpjVckpFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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