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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eab1b6a7f4739c7f914e403ae544e2a3c4ec87cb0e1613102f229d214c1ede57' 
  AND token = 'J6vRjU1o+FbEYG+okZNO26wnKOxGYZyX/xiMnxQ7HZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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