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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a7d8c8fa717ff0c31bcf9c764e0ba8b434fe1a2d014914e334a8a32735de5fc' 
  AND token = 'ij3RJkWATdTTsxLoe9iVK+ot35Q+LSf/jC0Lb49zk2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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