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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bf8d955cf50b3e9a3a9c32f5958ca2abeaf778e60cfa385ea072d6837fde9c2' 
  AND token = 'WmsBjBd8MO1slcR7k+Kr7LDsGIdOKUJoPQpXw8K8v2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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