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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d185c17c3e839d3b63741aac6eb4c5f11325705c8cb4141c49cb1aea318a5de' 
  AND token = '492Gp9Dd5v9efgW0K3kn9Wca04hRj/tvxo31YCBVcQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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