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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ba66de5dcb441ad3f51323ced9e61bf8c10606562bfa272e86b4752dba3d441' 
  AND token = 'mhI6a0pD7lKp/WNbjXNgP4uNnd/algIxjI0zIjfgZ/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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