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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f40e7589e82a2b2f7a3f44f1c61d1575f008e3fddaeb3c32fd72b1a1b3743f75' 
  AND token = 'b6Dvhl9j8zodEckltrO6vrqQrk6bOixqwnI6kRdg4Mk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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