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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60b6afac0acc78a0544c59e7bff3bc1a7e8881e9c7f337ca5db2e17d41089bfc' 
  AND token = 'otl5q35DnUks7peHzEx9vE10bPX1h2Qq+GtdWPVeBAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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