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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b234a7f9301f3b28d5770a328abcb411671d68ad0ed7f73276f34439c6316a20' 
  AND token = 'Gkc2XR3JNt0HdYsx6wTFLk6ElJM/8DWj+1+PDUNtDl0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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