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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef53021352c1d7f2fbec5a8855c1ec8c0fb34f5ede8711e1ab31b964539d4358' 
  AND token = 'BDc9uXr650uJ9iga37J0Ldl6D46xa4eCCoVuKto2jo0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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