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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2eb6e1367d715ef662cf4e37dcb8424ed9931f300486ba61d75e9ee6905b1492' 
  AND token = 'mPSHkmO0ULOMhX6cQgglTU2bXg89lvlkd3CSe9BZbSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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