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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c825d56cf188f28613cb9a9bfeb8a1661c98312de708c1511c62bbb2057fb482' 
  AND token = 'whKzHxbe97DKrw7Oh1NPOkSqii1tSzxm/r72+ga/9LQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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