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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dafa0e285a207a1431a9ca94a55a087acf37b47553e7abd7d922ff263b932641' 
  AND token = 'ra4Rai0CU3O7RR3jNAGU3BAr/qbQDHtghOPuFTZBw2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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