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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1151c4d26e0135c29c9e9bd0c22f25034a11a3a89b6e4cda42415af7bf699a8' 
  AND token = 'zU0KGRPSo740Fb5eHrtioQm0HQoWtWtJv46DL7FMLOw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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