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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c931cf40e6e710a30fcfb83403bc0c351fc42958b70f40438725375d2d543714' 
  AND token = '+iZrm4AHNzzeb0Qch32BT+f6eRVvbl7UTS3LIihuhDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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