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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '627e70a3ae7505720dae4c5d5fec8eadc8d1f217d5ebd5b4ebd53c3240d1f47f' 
  AND token = 'EWGW07lCJIFuhZyavOtS4Ok2iDSNuvIwHzY+wHv5f/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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