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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd13073358cbc2016c4b5fc73ad4b15a19e711152a032bb2e23cad5f669f7992' 
  AND token = 'R18Z+IxBblAnZ/Y/1/KBHF4Vv9xsenQW35/I/a0j1gg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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