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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64b982386cea8f00d9d1198d51dd38d887bb6300feb06c2e2e262228275fdc75' 
  AND token = 'Buzwfutr3+thNROWvk5qRqfnBaTaUH80OreCcpnA+io=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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