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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e3f659d988e13b680088c9157efc0293dbe1794e1a9c3c766588b86cb081675' 
  AND token = 'nw3/r0lmcAZGzequLnOgapm/iU4AF6unYc6qWl2VeDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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