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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd71be67e1b003fce6042f6538ca3ff5c5442d870cfa52be368997a3a6cc9d02d' 
  AND token = '04n1mhgeTEd3KuIrzuEbE0d0dZZ/0ebzcgnUMOWla54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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