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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35fd5ff2141352c87b1466b8b227baf62a18648328bca4c624fc4de0961dc694' 
  AND token = 'bn3jBemgNJOonsZ8ny88Q0DmdL9F6sSI9Vwmk+KS4GA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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