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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35ef33591645c06fac19ce6c951e078a4ae5d93e0ca92d7fbc664c37f6e57b43' 
  AND token = 'tLl6Z4mLWKKy8Xz7Qtzmv5r15Huco/62Kdi0unyd6B8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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