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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5443829ec2955dda7b73e08699a223d0168a83c4216851751835f96cd2d4104' 
  AND token = 'h1Km8tQoWWbbiPzlhZFKf721kz7S1O9je3KCjH7Ug7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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