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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55310065917337f081245f3125633aa089f1c286e9c62f0297521441ea014dca' 
  AND token = 'XbaSiiB0dXXDlRrBQz6Pmc7qCuA5JEHYtGs2l7R8j/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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