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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03afbb9cae9fca5a7795cb1cb2053c349ee8b6c47cbeaf8dc4a5126c1e8fc3ae' 
  AND token = '6pMGEqdQYn+BrL4v6PsJHcthfwP/PYcdoFsSxrid4xs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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