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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15bef16b7adf8a69f9a98d4fa5db7b1eb8b40c44a97565115484e9fb6a9db6b4' 
  AND token = 'DbVc52vbajtVlZN1P3CdUOlu1405oU4gXlfpYpEM7PE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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