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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '368329e5ecd1aba6eb2cdcaa3a9522617e13e0096be1e4191908ab566a947e8a' 
  AND token = '/XMQ6D71a6l4pHQ6SZfPZztc8Q53QZvOU5DIBHIEnLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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