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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a3eec6d3b8b234bb59a4d298ef110ae4b8b16e58ca0aa97b8afd497f3f1dfdf' 
  AND token = 'f6/AkeqFDi4o8r89/eE7JOfsxkDpdqW7MhfgcrhT0JA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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