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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bd30c68f520180fac252f619725ab542861d909641dee1e33ed8d89adf5edf1' 
  AND token = 'VnbZ7jH+vdDSO+Lc3Q9MgZyl7d6APe7e1iPbMIF6+YU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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