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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '676924d4e330b667673e748d2e221dd924b89ef84ed1311c0937af74d3a7fffb' 
  AND token = 'XUGcB99g1H+v5FNAl0K6iKVMG9P6f+Uj2mlnC2FjrRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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