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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '874f9617c19e8ac91571cdd87a810c4ebf6a55ba5a7ed2c1bc4e5bbbfa613aba' 
  AND token = 'BxuM2rMnJ0GQEyHdluBugsj4aWHN31nm7YPSWBlNMXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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